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Why can oxygen and carbon dioxide pass easily through the alveolar and capillary walls?
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Why can oxygen and carbon dioxide pass easily through the alveolar and capillary walls?

User Allence Vakharia
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The walls of the alveoli share a membrane with the capillaries. That's how close they are. This lets oxygen and carbon dioxide diffuse, or move freely, between the respiratory system and the bloodstream.
User ISpark
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